Electric-arc lamp.



No. 644,563. Patented Mar. 67 |900. T. E. ADAMS.

ELECTRIC ARC LAMP.

(Application led Sept. 20, 1899.)

(No Model.) 4 Sheets-Sheet l.

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No. (544?563. PatentedvMar. 6, ISOD.

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ELECTRIC ARG LAMP.

(Appucmn med sept. 2o, 1899.)

(No Model.) 4 Sheets-Sheet 2,

WITNESS/f5 7' /NI/ENTOR No. 644,563. Patented Mar. 6, |900; T. E. ADAMS.

ELECTRIC ABC LAMP.

(Application led Sept. 20, 1899.)

4 Sheets-Sheet 3A (Nu Model.)

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No. 644,563. Patented Mar. 6, |900. T. E. ADAMS.

ELECTRIC ABC LAMP.

Application filed Sept. 20, 1899.)

(No Model.) 4 Sheets-Sheet 4.

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UNITED STATES PATENT OFFICE.

THOMAS EDGAR ADAMS, OF CLEVELAND, OHIO.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent-No. 644,563, dated March 6, 1900.

Application filed September 20, 1899. Serial No. 731,123. (No model.)

To all whom it may concern;

Beit known that I, THonAs EDGAR ADAMs, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Electric-Arc Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to electric-arc lamps; and it consists in certain novel features of construction and combinations and arrangements of parts, as hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is an elevation with the casing shown in section. Fig. 2 is an enlarged view of the regulatormagnets and attached parts. Figs. 3, 4, 5, and 6 are views illustrating various details.

A represents the lamp-casing, made, preferably, of corrugated sheet-copper, circular in cross-section and having a aring lowering end A' and a flaring upper end A2. The upper edge of the portion A2 of the casing is provided with an outwardly-proj ectin g annular flange 1, which constitutes a seat for a stop-ring 2, preferably of cast metal. The ring 2 is made angularin cross-section. The horizont-al portion of the ring 2 is provided with a series of bosses 11, on which a peripheral liange 12 on a hood 13 rest-s and to which said iiange is secured by means of a series of screws 13% By securing the flange of the hood to the bosses on the ring 2 spaces will be left between said flange and ring for the admission of air, the admission of water being eectuallyprevented by the vertical flange 3 on said ring. The hood 13 is provided in its top with an opening 14, and over this opening a cap 15 is disposed. The cap 15 is provided on its under edge with lugs 17, which rest on the hood and form spaces between said cap and hood for the admission of air, and through said lugs fastening devices pass for securing the cap in place on the hood. The cap is provided with uprights 18 for the accommodation of an insulator 19 for the reception of means for suspending the lamp. Binding-posts 2O 21 are secured to and insulated from the cap at respective sides of the insulator 19 for the accommodation lof the leading-in wires.

A perforated basin 32 is located within the casing, near the bottom thereof, and is secured at its periphery thereto. The basin is pro-I vided on its bottom with lugs 33, to which a reflector 34 is secured, saidreliector also constituting a cover for the outer globe. Two depending arms 35 are secured to the basin and depend below the reiiector 34, said arms being provided in their lower ends with threaded sockets for the reception of screws 86. The screws 3G pass through lugs or ears 37 at diametrically-opposite sides of a circular plate 3S, and beneath said ears thumbnuts 39 are disposed on the screws for the purpose of supporting the plate 38 and also for securing the screws at different adjustments for a purpose which will be hereinafter made apparent.

The plate 38 is made with a central opening for the passage of a boss 40 of plate 46,

through which passes the upper carbon of the lamp and which constitutes a stop or rest for the clutch-ring of the lamp.

A depending rod 41, constituting the lamparm, is secured to and electrically connected at its upper end with the plat-e 3S, and at the lower end of said rod or lamp-arm 41 a holder 42 for the lower carbon of the lamp is secured.

An inner globe 43 incloses the lamp-arm 41 and the arc. The globe 43 may be made approXim ately oval in general form and having its lower contracted end closed and its upper end open. The lower contracted end of the globe 43 rests in the upper end of a conical convolute spring 44, and the latter is secured at it lowerend centrally between the ends of a wire yoke 45. The upper ends of the arms of the yoke are pivotally attached to the lower ends of the screws 86, and by means of these screws the tension of the spring, and consequently the pressure of thel open upper end of the globe against its cover, can be readily adj usted. The cover for the arc-inclosing globe consists of an iron plate 46, secured to the plate 38 and insulated therefrom by means of a disk 47, preferably of asbestos. The plate or cover 46 is provided with an annular flange 48,which depends into the globe and serves to conduct heat from the inner IOO -ing enhanced.

face thereof at its open end for the purpose of reducing liability of the globe to break on account of the unequal temperatures of the inner and outer faces thereof.

Regulator-magn ets B C are disposed within the upper part of the casing and provided with a common core having salient poles d Z1 and a consequent pole c. To the upper end of the magnet-core a knob 49, of brass or other non-magnetic material, is secured, and said knob is rigidly attached to the cap l5 by means of a screw 50, the magnets being thus suspended from said cap. A bar5l, of brass or othernon-magnetic material, is secured to the lower end of the magnet-core and provided with an enlargement 52, having an elongated face to bear against the inner wall of the body of the lamp-casing, to which it is rigidly secured by means of a screw 53. Thus the magnets and attached parts are rmly supported and the rigidity of the cas- The consequent pole of the magnet-core is projected laterally and pivotally supports the armature D at a point midway between the ends thereof, the respective ends of the armature being adapted to be attracted by the respective salient poles. The upper magnet B is of coarse wire and included in the main lamp-circuit and the lower magnetof fine wire and included in a shuntcircuit around the arc, a portion of the fine wire being preferably wound on the coarsewire winding of coil B and connected electrically to it. The upper end of the armature D carries a shoe 54C, adapted to normally make contact with an arm 55, projecting from a plate 56, secured upon and insulated from 1the upper pole-piece of the magnet-core. A coil 57 of resistance-wire is attached at its upper end to the shoe 54E and at its lower end to a bindingpost 5S, secured to and insulated from the armature, said coil being included (when the lamp` is not burning) in a shuntcircuit around the magnets, as shown in the diagrammatical view. The plate 56 also supports the upper end of a rod 59, of wood or other non-conducting material, the lower end of said rod being secured to the bar 5l. A resistance-coil 60 is coiled on the wooden rod 59 and electrically connected at one end to the plate 56, to which latter the plus terminal of the lamp and one terminal of the coarse-wire coil are also connected.

An arm 6l is secured vto the armature D and projects outwardly therefrom at or near the fulcrum thereof. The free outer end of the arm 6l is bifurcated for the reception of the upper end of the clutch-rod G2, which is pivotally attached thereto by means of a thumbscrew 63. The lower end of the rod 62 is provided with a hook 64, loosely connected to a lever 65 at a point between the ends of the latter. The lever 65 comprises two metal sections 66 67 and an intermediate section 68, of insulating material, (such as mica,) separating the metal sections. The free end of the section 6G of the clutch-lever is provided with a hook (i9, which engages the upper end of a clutch-lifter 70, the latter passing freely through the bottom of the basin and the reector or globe-cover and provided at its lower end with a hook 7l, which engages the flanged periphery of the clutch-ring 72. The wall of the basin is made with an inwardlyprojecting enlargement 73, (forming a recess 74 in the exterior of said basin,) and said enlargement is slotted for the free passage of the outer end of section 67 of the clutch-lever 65. The outer end of section G7 of the lever terminates within the recess 74 and is provided on its upper face with a pointed or conical pin 75, having a bearing in a similarly-shaped socket 76 in the roof of the recess 74. A screw 7G is passed through a wall of the recess 74C and provided with a head lo'- cated within said recess and disposed under the end of the clutch-lever, so as to prevent the displacement thereof.

By mounting the lever G5 as above explained friction is reduced to a minimum, and by the use of said lever a slight movement of the armature will cause a greater movement of the clutch-ring, and thus insure the proper operation of the clutch-ring should the hole therein become worn or should it be desired to employ a smaller carbon than the ring was originally intended to operate.

An insulated plate 77 is secured within the opening in the bottom of the basin and provided with a lug 78, to which the lower end of a slotted guide-tube 79 is secured. The upper end of the guide-tube is provided with a rod SO, which passes loosely through a hole in the plate 56, and thus the guide-tube is held securely in proper position. A holder for the upper carbon moves freely within the tube 79 and is provided with a head of graphite to reduce friction to a minimum.

An air-pot S5 is loosely attached to a bracket S6, secured to the guide-tube, and the rod 87, connected with the plunger of said air-pot,

passes down freely through the basin and rellector. The lower end of the rod 87 is provided with a head 8S, which rests upon the clutch-ring at the side thereof opposite the connection of the lifter therewith, so that the retarding action of the air-pot will come directly on the clutch, and thus serve to assist in the accurate operation of the latter and at the same time prevent the sudden pull of the magnets and the consequent too-sudden separation of the carbons.

Referring to the diagrammatical view, it will be observed that the normal circuit when the lamp is not burning is from the positive pole of the lamp by the conductor a to the plate 56, thence through the shoe 54: to the resistance 57 on the armature, and thence by wire if' to the negative terminal of the lamp. Sufficient current will pass through the coarsewire magnet to cause it to be actuated to separate the carbons, and the working circuit through the coarse-wire magnet may be traced as follows: from the positive pole of the lamp IOO by the wire a to the plate 56, thence through the coarse-wire coil B, and thence by wire c to the upper carbon of the lamp, thence to the lower carbon, and thence by wires d and b to the negative terminal of the lamp. As soon as the coarse-wire coil is energized the armature will be moved to separate the carbons, as is readily understood, and the circuit through the resistance 57 will be broken. A small amount of current may, however, be shunted around the coarse wire through a portion of the resistance 60, according to the adjustment of the shoe 60a. When the resistance of the working circuit increases by the lengthening of the arc, current will be shunted through the fine-wire coil to effect the feed of the carbon, as is well understood. The fine-wire shunt may be traced from the positive pole of the lamp by the wire a to plate 5G, then through a portion of the resistance GO, thence to the wire c', thence by wire e. to the fine-wire coil, thence by wire f to wire b', and thence to the negative terminal of the lamp.

A cut-out switch Q0 is preferably provided and consists of a shoe 91 and a lever 92, the latter having an insulated plate 93, to which a conductorg vis attached, the other end of said conductor being connected with the positive terminal of the lamp. The shoe 9lis connected with the negative terminal of the lamp and the lower carbon by means of the wire d.

I-Iaving fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

' l. In an electric-arc lamp, the combination with a magnet-coil in the main lamp-circuit, of ashunt-circuit around said coil and including a resistance, a circuit-breaker controlled by the armature of the magnet and included in said shunt-circuit and a constantly-closed shunt-circuit around the magnet-coil and including a variable resistance.

2. In an electric-arc lamp, the combination with a magnet-core having salient poles and a consequent pole, a coarse-wire winding on said core at one sideof said consequent pole, a fine-wire winding on the core at the other side of said consequent pole, a portion of said fine-wire winding being wound on the coarsewire coil and an armature pivotally mounted between its ends on the consequent pole and adapted to be actuated by the salient poles.

3. In an electric-arc lamp, the combination Vwith a casing and a hood, of a magnet secured with said shoe and the other end connected with a terminal of the lamp.

4. In an electric-arc lamp, the combination with a regulator-magnet and its armature, of a clutch-ring, a lifter therefor, a lever comprising two metal sections and an intermediate section of non-conducting material, the free end of one of said metal sections pivotally mounted in the frame of the lamp and the free end of the other metal section loosely connected with the lifter, and a rod attached at its upper end to the armature of the regulator-magnet and connected at its other end with said sectional lever at a point between the ends of the latter.

5. In an electric-arc lamp, the combination with a frame,a regulator-magnet and its armature, of a clutch-ring, a lifter therefor, a lever, an upwardly-projecting conical pin at one end of said lever, the frame having a bearing for said conical pin, a supporting device nnder the end of the lever having the conical pin, a loose connection between the other end of said lever and the lifter, and a rod attached at one end to the, armature of the regulator-magnet and at the other end to said lever at a point between the end of the latter.

6. In an electric-arc lamp, the combination with a regulator-magnet and its armature,of a clutch-ring, a lifter therefor, connections between said lever and the armature of the magnet, an air-pot in the lower part of the lamp and a rod projecting downwardly from the plunger of said air-pot and resting on the clutch-ring at the side thereof opposite the connection of the lifter therewith.

7. I-n an arc-inclosed electric-arc lamp, the combination with a frame, an inner arc-inclosing globe and a cover for said globe, of a vertically-adj ustable yoke inclosing the globe and adapted to Vbe swung laterally and a spring iixed upon the bottom of the yoke and constructed to form a socket foi1 the bottom of the globe.

S. In an electric-arc lamp, the combination with a casing .and arms or posts depending therefrom and having threaded sockets, of screws entering said sockets and depending therefrom, thumb-nuts for locking said screws, an inner globe, a cover therefor, a yoke embracing the globe and having its ends attached to said screws and a spring carried by said yoke and bearing against the bottom of the globe.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

THOMAS EDGAR ADAMS.

Witnesses:

T. F. BEIDLER, JOHN D. EsTEL.

IOO

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